Unexpected strict mode reserved word typescript

Reserving Words: An Unexpected Error in TypeScript

To address the issue, it’s important to understand the differentiation between a compilation error and a runtime error. Based on the symptoms you’ve described, it appears that the problem you’re encountering is related to a runtime error.

TypeScript: Unexpected reserved word

It’s important to distinguish between two types of errors: compilation errors and runtime errors. Based on your experience, it appears that you are encountering a runtime error. To troubleshoot this issue, I recommend examining the JavaScript file that is being executed by Node.js.

At present, ES6 module syntax is not supported by Node.js. To ensure compatibility, it is necessary to have the module field within tsconfig.json set to commonjs . In the output JavaScript file, it is recommended that import mongodb = require(‘mongodb’); be emitted as either const mongodb = require(‘mongodb’); for ES6 targeting or var mongodb = require(‘mongodb’); for ES5 targeting.

Parsing error: The keyword ‘class’ is reserved, Parsing error: The keyword ‘class’ is reserved. Ask Question Asked 2 years, 9 months ago. Modified 1 year, 8 months ago. Viewed 3k times 1 I have a class object that I thought was working last night. But now I try to test out my set Hash method so I do: blah = new HashTable; and it says that HashTable isn’t …

Unexpected reserved word ‘import’ when using babel

It appears that the presets you’re using may not be correct. With the release of babel 6, the core babel loader no longer has the ES6 transforms that were previously included by default. Instead, it has become a platform for generic code transformation, and you now need to use a preset to achieve the desired result.

Another requirement is the installation of the preset package.

npm install --save-dev babel-preset-es2015 

Does the absence of transpilation suggest that the .js file in the node_modules directory is being loaded? If that is the case, you should consider taking the following steps:

The ignoring of all requires to node_modules is the default behavior, but you can change this by providing an ignore regex.

Visit the following link to learn about how to utilize «require» in Babel: https://babeljs.io/docs/usage/require/

Encountering an issue while attempting to execute tests using mocha, I resolved it by adding the necessary code snippet to my package.json.

My understanding of the working mechanism is not entirely clear. I am conducting experiments in a similar manner.

mocha --compilers js:babel-core/register --require ./test/test_helper.js --recursive 

In due course, I imagine this will become comprehensible.

Javascript — Typescript Parsing error: Unexpected Token, Typescript Parsing error: Unexpected Token Type When Importing const tuple. Ask Question Asked 1 year, 4 months ago. Modified 1 year, 4 months ago. Viewed 178 times 1 I have file1 in which I have the following type definition: export const repeatIntervals = [ ‘never’, ‘day’, ‘week’, ‘two weeks’, ‘month’, ] as …

Conditional Types. Parsing error from TypeScript eslint

Starting from Typescript version 4.1, support is available for template literals.

It is required that you upgrade your TS version.

Unexpected reserved word ‘import’ when using babel, This is a common error when running plain Node, which means you’re likely seeing this because Babel isn’t actually running. I would recommend switching over the the babel-register module as suggested by the docs since you’re using Babel 6. Then make sure the file in question isn’t getting ignored. See … Usage examplenpm install —save-dev babel-preset-es2015Feedback

Jest test on typescript file syntax error: «interface is a reserved word in strict mode»

The error was resolved once I included the code » @babel/preset-typescript » in my presets.

"test": < "presets": [ "@babel/preset-typescript", // > ] ], "plugins": [ [ "styled-components", < "ssr": true, "displayName": true >] ] > 

If the preset @babel/typescript does not produce the desired outcome, you may attempt the following.

1. Alter the name of the deficient test file to either .ts or .tsx , according to the presence or absence of JSX in your test. In the latter scenario, name it as Astronaut.test.tsx .
2. Revise the documentation for your jest configuration, specifically in the package.json file, and include the necessary changes.

"moduleFileExtensions": [ "js", "ts", "tsx" ], 

The declaration of your constant lacks a variable name. You can use any of the following syntax to declare a constant variable: const variableName: Type = new Type(), const variableName: Type; or const variableName = new Type;

Jest test on typescript file syntax error: «interface is a, Teams. Q&A for work. Connect and share knowledge within a single location that is structured and easy to search. Learn more about Teams

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Unexpected strict mode reserved word at createScript #16431

Unexpected strict mode reserved word at createScript #16431

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Hello ,
When I’m running my typescript file using node file.ts
it is showing unexpected error.
Unexpected token : in one file when I’m using
let burger: string = «McD»;
and in other file it is showing Unexpected strict mode reserved word at createScript when I’m running the below code:
class program constructor(private msg: string)

constructor(private msg: string) ^^^^^^^
SyntaxError: Unexpected strict mode reserved word
at createScript (vm.js:56:10)
at Object.runInThisContext (vm.js:97:10)
at Module._compile (module.js:542:28)
at Object.Module._extensions..js (module.js:579:10)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)
at Module.runMain (module.js:604:10)
at run (bootstrap_node.js:393:7)
at startup (bootstrap_node.js:150:9)
Don’t know why but was working fine previously now it is showing error.
I’m using node ,npm,typescript latest versions and VS Code.

The text was updated successfully, but these errors were encountered:

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Unexpected strict mode reserved word typescript

Last updated: Dec 28, 2022
Reading time · 2 min

# Unexpected strict mode reserved word ‘yield’ in JavaScript

The «SyntaxError: Unexpected strict mode reserved word yield» occurs when the yield keyword is used outside of a generator function.

To solve the error, mark the function as a generator by appending an asterisk to the function keyword, e.g. function* generator() <> .

Here’s an example of how the error occurs.

Copied! 
function example()  // ⛔️ SyntaxError: Unexpected strict mode reserved word 'yield' yield 10; yield 15; > 

We used the yield keyword inside of a function that we didn’t mark as a generator.

# Add an asterisk to mark the function as a generator

Add an asterisk after the function keyword to mark a function as a generator.

Copied! 
// ✅ works function* generator()  yield 10; yield 15; > const gen = generator(); console.log(gen.next().value); // 👉️ 10 console.log(gen.next().value); // 👉️ 15 

Note that arrow functions cannot be declared as generators. You can only use the yield keyword inside of named functions that were declared as generators.

# The directly enclosing function has to be marked as a generator

The directly enclosing function has to be a generator for you to be able to use the yield keyword.

Here’s an example of nested functions.

Copied! 
function generator()  return function* inner()  yield 10; yield 15; >; > const gen = generator()(); console.log(gen.next().value); // 👉️ 10 console.log(gen.next().value); // 👉️ 15 

Notice that we marked the inner function as a generator and not the outer one.

This is because we use the yield keyword inside of the inner function.

To be able to use the yield keyword, declare the directly enclosing function as a generator.

I wrote a book in which I share everything I know about how to become a better, more efficient programmer.

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unexpected strict mode reserved word — yield? Node v0.11, harmony, es6

If you want to use generators to do asynchronous operation in synchronous fashion you must do it like:

co(function*() < "use strict"; < let a = 'I am declared inside an anonymous block'; >var Robe = require('robe'); var db1 = yield Robe.connect('127.0.0.1'); >)(); 

where co realization you can find in:

In strict mode you cannot use yield outside of the generators. In non-strict mode outside of the generators yield will be considered as variable identifier — so in your case it’ll throw an error anyway.

Solution 2

Also noteworthy. new versions of co return/use promises rather than thunks. So this is what worked with newer versions of co.

var co = require('co'); co(function*() < "use strict"; < let a = 'I am declared inside an anonymous block'; >var Robe = require('robe'); var db1 = yield Robe.connect('127.0.0.1/swot'); console.log(db1) return db1; >).then(function (value) < console.log(value); >, function (err) < console.error(err.stack); >); 

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Trying to use a new ES6 based node.js ODM for Mongo (Robe http://hiddentao.github.io/robe/) Getting «unexpected strict mode reserved word» error. Am I dong something wrong here? test0.js

"use strict"; // Random ES6 (works) < let a = 'I am declared inside an anonymous block'; >var Robe = require('robe'); // :( var db1 = yield Robe.connect('127.0.0.1'); 

C:\TestWS>node --version v0.11.10 C:\TestWS>node --harmony test0.js C:\TestWS\test0.js:12 var db1 = yield Robe.connect('127.0.0.1'); ^^^^^ SyntaxError: Unexpected strict mode reserved word at exports.runInThisContext (vm.js:69:16) at Module._compile (module.js:432:25) at Object.Module._extensions..js (module.js:467:10) at Module.load (module.js:349:32) at Function.Module._load (module.js:305:12) at Function.Module.runMain (module.js:490:10) at startup (node.js:123:16) at node.js:1031:3 

Awesome. Thank yo, Alex, Kind of a brain-dead moment for me. Makes sense. 1.) Need to actually yield from within something yieldable (i.e. a generator 2.) Use said generator in something that can execute it for you transparently (co, Task.js etc)

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